Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc414dde94c2e3e…

MALICIOUS

PDF

41.1 KB Created: 2020-08-23 02:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afd53274e0ea17249bf6691ec551f3f1 SHA-1: bdc87c8093df70ab24bd8d4c40f21575144209b4 SHA-256: dfc414dde94c2e3effa88ce755ddd5cdc0fb9ae30d3a33966972df0379fdc6e7
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.com/pify?keyword=audible++manager+windows+xp, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=audible++manager+windows+xp
    • http://files.crypto-story.com/uploads/1/3/2/3/132303099/jixajiwominotubuke.pdf
    • http://files.rogerbarnard.com/uploads/1/3/1/8/131856672/jesitisut.pdf
    • https://cdn.shopify.com/s/files/1/0432/1004/7645/files/calendario_2020_julho.pdf
    • https://cdn.shopify.com/s/files/1/0439/7151/0430/files/serelitigegezamajinaxu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/pekekemumasobo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7682/0890/files/before_sunrise_full_movie_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0435/7577/1304/files/43157313275.pdf
    • https://cdn.shopify.com/s/files/1/0433/5498/0507/files/xogujofiwaxiwemu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9146/7176/files/purpose_driven_life_ebook_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/2603/7411/files/a_first_course_in_computational_algebraic_geometry.pdf
    • https://cdn.shopify.com/s/files/1/0434/5046/6471/files/application_x-_www-_form-_urlencoded_body_json.pdf
    • https://cdn.shopify.com/s/files/1/0432/9648/9632/files/36944243195.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061d6.bin
87007d9c897c38d7feec389627d20fc8f987c3fef7ed3ea99a1c9cbc2a6bb675		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61D6 5568 bytes
font_01_sfnt_off000074b2.bin
e2bb2598e270d3d5cf7321b59eb496b2185f19f72c49d3efd92e8c449fde9a53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74B2 10344 bytes

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